Nimzo-Indian: 4.e3 O-O 5.Bd3 d6

Before the first move

The Nimzo-Indian Defense is a sophisticated battle where Black pins the knight on c3 to control the center. In the Rubinstein System with 4.e3, White builds a solid center and develops calmly, while Black's 5...d6 prepares a flexible structure that can challenge White's space with either e5 or c5 later.

1. d4White · your move

Push your pawn to d4. This move claims central space, controls the c5 and e5 squares, and opens lines for your queen and dark-squared bishop. It is the foundation for many of the most strategic and deep openings in chess.

1... Nf6Black

Black replies with Nf6, the most common and flexible response. By developing the knight, Black controls e4 and prepares to react to White's next moves. Other options like d5 (Queen's Gambit) or the sharp Englund Gambit with e5 are also possible here.

Other paths here: Na6 (Australian Defense) · g5 (Borg Defense: Borg Gambit) · b6 (English Defense) · e5 (Englund Gambit)

2. c4White · your move

Advance your pawn to c4. This move exerts further pressure on the d5 square and prepares to develop your knight behind the pawn. It is a key component of the Queen's Gambit and Indian structures, aiming for a large central presence.

Other paths here: f4 (Canard Opening) · g4 (Indian Defense: Gibbins-Weidenhagen Gambit) · e4 (Indian Defense: Omega Gambit) · d5 (Indian Defense: Pawn Push Variation)

2... e6Black

Black chooses e6, a solid move that prepares to develop the dark-squared bishop. This often leads to the Queen's Gambit Declined or the Nimzo-Indian. Black could also try the Queen's Indian with b6 or the sharp Benoni with c5 to create immediate imbalances.

Other paths here: g5 (Indian Defense: Medusa Gambit) · b5 (Indian Defense: Pyrenees Gambit) · a6 (Indian: 2.c4 a6) · Nc6 (Mexican Defense)

3. Nc3White · your move

Develop your knight to c3. This is the most ambitious square for the knight, putting direct pressure on d5 and e4. You are inviting Black to pin the knight, which leads to the complex and highly theoretical Nimzo-Indian Defense.

Other paths here: g3 (Catalan Opening) · Qb3 (Indian Defense) · g4 (Indian Defense: Devin Gambit) · Bg5 (Indian Defense: Seirawan Attack)

3... Bb4Black

Black plays Bb4, pinning the knight and entering the Nimzo-Indian. This is a highly respected opening that focuses on piece activity and dark-square control. Black could also play d5 to enter the Queen's Gambit or b6 to transition into a Queen's Indian setup.

Other paths here: b6 (Queen's Pawn: Neo-Indian, 3...b6) · c5 (Queen's Pawn: Neo-Indian, 3...c5) · d5 (Queen's Gambit Declined: Exchange Variation)

4. e3White · your move

Push your pawn to e3. This move characterizes the Rubinstein System, one of the most solid ways to meet the Nimzo-Indian. You protect d4 and prepare to develop your king's bishop, prioritizing safety and a strong central core.

Other paths here: f3 (Nimzo-Indian Defense: Kmoch Variation) · Qd3 (Nimzo-Indian Defense: Mikenas Attack) · g3 (Nimzo-Indian Defense: Romanishin Variation) · Bd2 (Nimzo-Indian: 4.Bd2)

4... O-OBlack

Black castles kingside, completing a vital step in development. This is the most common response, though Black sometimes delays castling to play c5 or b6 immediately. By castling now, Black ensures king safety before deciding on a specific central pawn break.

Other paths here: Nc6 (Nimzo-Indian Defense: Rubinstein System, Taimanov Variation) · c5 (Nimzo-Indian Defense: Rubinstein System) · b6 (Nimzo-Indian Defense: St. Petersburg Variation) · d5 (Keres Variation, Nimzo-Indian)

5. Bd3White · your move

Develop your bishop to d3. This is the most active square for the bishop, where it eyes the h7 pawn and supports the center. You are preparing to castle and completing your minor piece development on the kingside.

Other paths here: Ne2 (Nimzo-Indian Defense: Reshevsky Variation) · Nf3 (Nimzo-Indian Defense) · a3 (Nimzo-Indian Defense: Sämisch Variation)

5... d6Black

Black plays d6, choosing a flexible and somewhat modern approach. This move prepares the e5 break and keeps the position closed for now. More traditional alternatives include d5, which challenges the center directly, or c5, which strikes at the d4 pawn immediately.

Other paths here: b6 (Nimzo-Indian: 4.e3 O-O 5.Bd3 b6) · c5 (Nimzo-Indian: 4.e3 O-O 5.Bd3 c5) · d5 (Nimzo-Indian Defense: Normal Variation, Classical Defense)

Where you stand

The position is strategically rich and balanced. White will likely develop the kingside knight to e2 or f3 and castle, aiming to use their space advantage. Black plans to challenge the center with e5 or c5, utilizing the pressure from the pinned knight on c3 to create counterplay. Both sides must carefully manage their pawn breaks and piece coordination.

• g1-e2 Develop knight to e2 to support center
• e1-g1 Castle kingside to secure the king
• e6-e5 Push e5 to challenge the white center
• b4-c3 Trade bishop for knight to damage structure